Malicious PDF — malware analysis report

Static analysis result for SHA-256 28f16d44e058195b…

MALICIOUS

PDF

82.3 KB Created: 2021-06-08 22:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 3f1cac919aab63b715b02c8f1e7b1a75 SHA-1: e3272d4067ea835cdc5b1d3632e7433b747acbf7 SHA-256: 28f16d44e058195ba414836f1948a4d631360a3341e65f34a019d37124016fcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pistant.ru/uplcv?utm_term=yeh+rishta+kya+kehlata+hai+title+song+mp3 PDF link annotation
    • https://strechybenesov.cz/content/49607781187.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/44496035fa8e767a98c00d88c16d6dd7/wusuwomuwazevebopeladu.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786554e5a85---97966760301.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/9a9d333d047ad9dd143730699fafc2f2/dogekujavutaze.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/3461832569.pdfIn PDF document text
    • http://armanetti.com/images/nusewekodovinegabemojex.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/25010454600.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/51753855423.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083857783ac1---nabumigopinikegapuzib.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/nunusoben.pdfIn PDF document text
    • http://pneusmarene.it/images/file/relulagot.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa70ed40003---fusadudowulumi.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/15162655839.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/055866b04451aa7b03f4445a7f6b08df/31947038651.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecb7cd512f---34949500377.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00011e08.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11E08 8200 bytes
SHA-256: 837276da26ff0a6b72f1f52182df4c95bf8ad791562d8b6b03cd5f580f8ea1cd
font_00_sfnt_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 5524 bytes
SHA-256: 0b65b4aa27eb98663377cc5ab55afcce67f088c3ceaa56c4b50af89b00ea1c1a
font_01_sfnt_off0000eea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA0 2128 bytes
SHA-256: 18f47e14b033b9868918b882439b75cbf81e22a18dc542528a66a0b8b339fdc8
font_02_sfnt_off0000f870.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF870 10912 bytes
SHA-256: 4a6ec4cee45fef0abb01e50753a6017eef2ffc65e9a28a6346481c71b3bbe95f